Curious Map

In the house of the Cartographer in Majula, go down to the basement. At first, a small flame can be seen. This represents a location with a bonfire or set of bonfires lit completely at a location. Once all of the bonfires have been lit in the game, go find Cale the Cartographer in the Forest of Fallen Giants and talk to him, and then go back to his house in Majula and talk to him in the basement. Afterward, the achievement will be triggered.